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Swing-Nut Tubing Cutter: Swing the Blade Support Down and the Jaw Slides to the Tube, Up and the Screw Feeds It (Pritchard, 1941)
Frank L. Pritchard · Public domain
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Swing-Nut Tubing Cutter: Swing the Blade Support Down and the Jaw Slides to the Tube, Up and the Screw Feeds It (Pritchard, 1941)

Frank L. Pritchard of Parker, Arizona, received US 2,231,593, dated 11 February 1941, for a tubing cutter small enough for a mechanic's tool box. The tube sits in a V in a fixed jaw. A movable jaw slides on the adjusting screw and a guide pin, with a spring pushing the jaws apart. The cutting wheel is held by a pivoted support with threads on its inner edge. Swung down, the support lets go of the screw, so the jaw can be pushed straight onto any tube. Swung up, it meshes with the screw again and the screw feeds the wheel in. We make his parts from steel bar and plate. All sizes are ours.
Kati
About 3 days

Maagizo

1

The swing that lets go

Inapakia daftari la Jupyter…
2

Read US 2,231,593

"The pivoted blade support 16 may swing downwardly until the threads thereof will be free of the threads of the screw 8. The movable jaw 6 may now be slid downwardly until the pivoted blade support is in its proper cutting position."
3

Print the template

Both jaws, the blade support, the wheel and a 15 mm tube at 1:1, with the screw, pin and pivot holes. print at 100 % (check the 50 mm bar).
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Pakua modeli
4

Make the stationary jaw

Saw 64 mm of 16 mm square bar, or of 16 mm plate. File the 90 degree V 8 mm deep in its top face. Drill the 6 mm pin hole and a 10 mm hole for the screw, and counterbore the pin hole 10 mm across, 5 mm deep, for the spring. Drill the 3 mm cross-pin hole across the jaw so it just cuts into the side of the screw hole.

Vifaa kwa hatua hii:

Bamba la chuma lainiBamba la chuma laini1 kipande

Zana zinazohitajika:

Msumeno wa chumaMsumeno wa chuma
Seti ya tupaSeti ya tupa
Kekee cha NguzoKekee cha Nguzo
Kibano cha mashineKibano cha mashine
Seti ya vichimbuziSeti ya vichimbuzi
Kigwe cha KatikatiKigwe cha Katikati
Kichora MistariKichora Mistari
Kibano cha meza ya kaziKibano cha meza ya kazi
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
5

Make the movable jaw and the support

Saw the movable jaw 50 mm long from the same bar. Drill the 6.2 mm pin hole and its spring counterbore. Saw and file a slot 8.2 mm wide down its middle, from 22 mm to the end. Saw the blade support from 14 mm plate to the template. File its upper part down to 8 mm thick, centred, so it slides into the slot, and file away its lower inner corner. Saw a 7 mm slot up its lower part for the wheel. Drill the pivot and stop-pin holes through the jaw and support together, and file the stop-pin hole in the support into a short slot.

Vifaa kwa hatua hii:

Bamba la chuma lainiBamba la chuma laini1 kipande

Zana zinazohitajika:

Msumeno wa chumaMsumeno wa chuma
Seti ya tupaSeti ya tupa
Seti ya tupa ndogoSeti ya tupa ndogo
Kekee cha NguzoKekee cha Nguzo
Kibano cha mashineKibano cha mashine
Seti ya vichimbuziSeti ya vichimbuzi
Kibano cha meza ya kaziKibano cha meza ya kazi
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
6

Tap the half nut

Pin the support in the jaw, swung up, and clamp it there. Drill 6.8 mm down the screw axis through both, so the drill cuts a shallow groove in the support's inner edge, then tap it M8 through both. Take the support out and open the jaw's own hole to 8.5 mm, so the screw passes freely and only the support's threads hold it.

Zana zinazohitajika:

Kekee cha NguzoKekee cha Nguzo
Kibano cha mashineKibano cha mashine
Seti ya vichimbuziSeti ya vichimbuzi
Seti ya kukata nyuzi za skrubuSeti ya kukata nyuzi za skrubu
Mafuta ya kukatiaMafuta ya kukatia
7

Make the screw and the guide pin

Turn the top 62 mm of a 90 mm piece of 10 mm bar to 8 mm and cut an M8 thread on it with the die. Turn a groove 1.5 mm deep and 3.2 mm wide in the plain part, where the cross pin will sit, and drill a 6 mm hole across its bottom end for a T-bar. Cut the guide pin, 80 mm of 6 mm rod, and drill a 3 mm hole across its top for the stop pin.

Vifaa kwa hatua hii:

Ufito mviringo wa chuma lainiUfito mviringo wa chuma laini1 kipande
Ufito wa chuma lainiUfito wa chuma laini1 kipande

Zana zinazohitajika:

Kereza ya ChumaKereza ya Chuma
Chaki ya kereza yenye makucha 3Chaki ya kereza yenye makucha 3
Chombo cha kukata cha latheChombo cha kukata cha lathe
Patasi ya kukata kaziPatasi ya kukata kazi
Seti ya kukata nyuzi za skrubuSeti ya kukata nyuzi za skrubu
Kekee cha NguzoKekee cha Nguzo
Seti ya vichimbuziSeti ya vichimbuzi
Msumeno wa chumaMsumeno wa chuma
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
8

Turn the cutting wheel

Chuck a tool steel bar and face it. Turn the end to 20 mm across for 10 mm, centre drill and drill a 5 mm hole 10 mm deep, and turn the edge to a 50 degree vee, 25 degrees each side, sharp in the middle of the 6 mm width. Part it off 6 mm long and take the burr off the hole.

Vifaa kwa hatua hii:

Fito ya chuma cha zanaFito ya chuma cha zana1 kipande

Zana zinazohitajika:

Kereza ya ChumaKereza ya Chuma
Chaki ya kereza yenye makucha 3Chaki ya kereza yenye makucha 3
Chombo cha kukata cha latheChombo cha kukata cha lathe
Patasi ya kukata kaziPatasi ya kukata kazi
Seti ya bit za kuanzia shimoSeti ya bit za kuanzia shimo
Seti ya vichimbuziSeti ya vichimbuzi
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
Miwani ya usalamaMiwani ya usalama
9

Harden and temper

Heat the wheel to a cherry red, until a magnet no longer sticks, and quench it in water, moving it about. Rub it bright with a stone, warm it on a piece of steel plate over the fire, and quench again as soon as it turns a light straw colour.

Zana zinazohitajika:

Jiko la KufuaJiko la Kufua
Koleo la forjiKoleo la forji
Sumaku NdogoSumaku Ndogo
Ndoo ya kupoza chumaNdoo ya kupoza chuma
MajiMaji
Jiwe la KunoleaJiwe la Kunolea
Glavu za kulehemuGlavu za kulehemu
Miwani ya usalamaMiwani ya usalama
10

Assemble

Drive the guide pin into the stationary jaw. Put the screw into its hole from below and drive the cross pin in so it lies in the groove; the screw must still turn. Fit the T-bar. Slip the spring over the guide pin, then the movable jaw over the pin and the screw, and put the stop pin across the top. Fit the wheel in the support on its 5 mm pin, and pin the support into the jaw with its pivot and stop pins. Rivet a 1.5 mm steel strip along the top of the jaw, sticking out past the support as a thumb piece. Oil the threads.

Vifaa kwa hatua hii:

Pini ya chuma ya kuunganishaPini ya chuma ya kuunganisha5 vipande
Seti ya springi za kubanaSeti ya springi za kubana1 kipande
Utepe wa chuma cha springiUtepe wa chuma cha springi1 kipande
Rivet za chuma cha puaRivet za chuma cha pua2 vipande
Ufito wa chuma lainiUfito wa chuma laini1 kipande

Zana zinazohitajika:

Nyundo yenye kichwa cha duaraNyundo yenye kichwa cha duara
Kigwe cha KatikatiKigwe cha Katikati
Kibano cha meza ya kaziKibano cha meza ya kazi
Kekee cha NguzoKekee cha Nguzo
Seti ya vichimbuziSeti ya vichimbuzi
Mafuta ya kukatiaMafuta ya kukatia
11

Cut a copper tube

Mark a copper tube and hold it in a vice with soft jaws, or by hand for small tubes. Swing the support down, push the movable jaw down until the wheel touches the tube in the V, swing it up into the screw, and tighten the screw a little. Turn the cutter once round, give the screw about a quarter turn, and go on until the tube parts. The wheel should run in its own groove; the end should be square and not squeezed oval. Clean the inside of the end with a deburring tool.

Vifaa kwa hatua hii:

Mrija wa shaba-njekunduMrija wa shaba-njekundu1 kipande

Zana zinazohitajika:

Kibano cha meza ya kaziKibano cha meza ya kazi
Kifaa cha kuondoa ukingoKifaa cha kuondoa ukingo
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
12

Troubleshooting

Swing-nut tubing cutter troubleshooting.

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13

History and honest limits

**Frank L. Pritchard** of Parker, Arizona, US 2,231,593, dated 11 February 1941, filed 17 November 1939. He claimed "a pivoted blade support mounted on the movable jaw and having threads on the inner edge thereof adapted to engage the threads of said screw". His movable jaw had a bushing for the guide pin and a looped handle on the screw head; ours has a drilled hole and a T-bar. The patent gives no sizes or materials; all of ours are ours.

Vifaa

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Zana Zinazohitajika

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

V-Slide Tubing Cutter: Two Slide Halves Held on the Ways by One Spring Clip, a Reamer on the Frame (Thewes, 1938)

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